Kim Utting, 52, from Litcham died in the crash at Dereham when she was travelling a green Peugeot 406 towards Norwich at around

The car, driven by her daughter Emma Herring, 30, was in collision with a red Skoda Felicia travelling in the opposite direction.

The male driver of the Skoda was seriously hurt and remains in hospital where his condition is improving.

Steve Matthews from the serious collision investigation team said: “I am still trying to trace the driver of a lorry which was driving towards Norwich eastbound. “The lorry had a white cab and what appeared to be something reflective tied to its offside wing mirror.

“Its flatbed semi-trailer was unladen and it failed to stop at the scene.

“The driver may have important information about the collision and I would urge them to get in contact as soon as possible.”

Officers would also still like to speak to the driver of a small black Peugeot hatchback car which was seen driving erratically towards Norwich and overtook the green Peugeot and the lorry.

Anyone with information on these vehicles should contact the Serious Collision Investigation Team on 101.